High-voltage power supply starting control method for X-ray source

Abstract

The invention discloses a high-voltage power supply starting control method for an X-ray source. The high-voltage power supply starting control method comprises the following steps: setting a first voltage starting partition, a second voltage starting partition and a third voltage starting partition according to a volt-ampere characteristic curve of an X-ray bulb tube; if the target starting voltage is in the first voltage partition, starting is carried out at a first voltage climbing slope; if the target starting voltage is in the second voltage subarea, starting at a first voltage climbing slope until the voltage reaches the maximum voltage value of the first voltage subarea, and starting at a second voltage climbing slope until the voltage reaches the maximum voltage value of the second voltage subarea; if the target starting voltage is in the third voltage subarea, starting at a first voltage climbing slope until the voltage reaches the maximum voltage value of the first voltage subarea, and starting at a second voltage climbing slope until the voltage reaches the maximum voltage value of the second voltage subarea; and finally starting at a third voltage climbing slope until the voltage reaches the maximum voltage value of the third voltage partition.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage power supplies, and in particular to a high-voltage power supply startup control method for an X-ray source. Background Art

[0002] High voltage power supply has the advantages of high efficiency, stable performance and compact structure. Therefore, high voltage power supply is widely used in industrial automation, medical equipment, power transmission and other fields.

[0003] In high-voltage power supply systems, the traditional full-voltage starting method causes the current to rise sharply during startup, far exceeding the rated value, causing significant energy loss and system impact. This high starting current may also cause a transient drop in the voltage of the power supply system, affecting power supply stability. In addition, under frequent starting conditions, full-voltage starting not only causes large energy losses, but also takes a long time for the equipment to reach a stable operating state.

[0004] Therefore, how to improve the full voltage starting method to achieve a fast and stable operation state has become a problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, an embodiment of the present invention provides a high-voltage power supply startup control method for an X-ray source to solve the problem of unstable power supply under frequent startup conditions in the full-voltage startup method for X-ray tubes in the prior art.

[0006] An embodiment of the present invention provides a high voltage power supply startup control method for an X-ray source, comprising:

[0007] The first voltage start-up partition, the second voltage start-up partition and the third voltage start-up partition are set according to the volt-ampere characteristic curve of the X-ray tube; wherein the maximum voltage value of the first voltage start-up partition is the minimum voltage value of the second voltage start-up partition, and the maximum voltage value of the second voltage start-up partition is the minimum voltage value of the third voltage start-up partition;

[0008] If the target starting voltage is within the first voltage partition, starting is performed at a first voltage ramp slope until the voltage reaches the maximum voltage value of the first voltage starting partition;

[0009] If the target startup voltage is within the second voltage partition, the startup is performed with the first voltage ramp slope until the voltage reaches the maximum voltage value of the first voltage partition, and then the startup is performed with the second voltage ramp slope until the voltage reaches the maximum voltage value of the second voltage partition;

[0010] If the target starting voltage is within the third voltage partition, the vehicle is first started with the first voltage climbing slope until the voltage reaches the maximum voltage value of the first voltage partition, and then started with the second voltage climbing slope until the voltage reaches the maximum voltage value of the second voltage partition; finally, the vehicle is started with the third voltage climbing slope until the voltage reaches the maximum voltage value of the third voltage partition.

[0011] Optionally, setting the first voltage start-up partition, the second voltage start-up partition, and the third voltage start-up partition according to the volt-ampere characteristic curve of the X-ray tube includes:

[0012] The voltage values ​​of the volt-ampere characteristic curve of the X-ray tube at the positions of curvature dI / dU=1, dI / dU=0.25 and dI / dU=0.125 are obtained as the maximum voltage value U1 of the first voltage start-up partition, the maximum voltage value U2 of the second voltage start-up partition and the maximum voltage value U3 of the third voltage start-up partition, respectively; wherein the maximum voltage value U3 is the rated voltage of the X-ray tube.

[0013] Optionally, the first voltage climbing slope is:

[0014]

[0015] The second voltage ramp slope is:

[0016]

[0017] The third voltage climbing slope is:

[0018]

[0019] Wherein, T is the full voltage startup target time.

[0020] Optionally, the full voltage startup target time T is greater than or equal to 250 ms.

[0021] Optionally, it also includes:

[0022] When the target startup voltage is within the first voltage partition, the high voltage power supply is placed in a zero current switching state;

[0023] When the target startup voltage is within the second voltage partition or the third voltage partition, the current of the high voltage power supply is output along with the voltage.

[0024] Optionally, the minimum voltage of the first voltage partition is 0.

[0025] Optionally, it also includes:

[0026] Apply an initial positive DC voltage and an initial negative DC voltage of the same amplitude to the anode and cathode of the X-ray tube, respectively, and record the initial current value;

[0027] Change the positive DC voltage amplitude and negative DC voltage amplitude, and record the real-time current value;

[0028] With kV as the unit of voltage U and uA as the unit of current I, the volt-ampere characteristic curve of the X-ray tube is obtained by fitting.

[0029] Beneficial effects of the present invention:

[0030] 1. The embodiment of the present invention provides a high-voltage power supply startup control method for an X-ray source, which adopts a three-stage voltage startup. By gradually reaching the working voltage, the X-ray tube can work in a stable state, which helps to improve the quality of imaging.

[0031] 2. The embodiment of the present invention avoids thermal shock and mechanical stress caused by rapid voltage changes through three-stage startup, thereby reducing the failure rate of the X-ray tube and other power supply components. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0033] Figure 1 A flow chart of a high voltage power supply startup control method for an X-ray source in an embodiment of the present invention is shown;

[0034] Figure 2 The volt-ampere characteristic curve of an X-ray tube in an embodiment of the present invention is shown;

[0035] Figure 3 The voltage and current start-up curves of a high voltage power supply start-up control method for an X-ray source in an embodiment of the present invention are shown;

[0036] Figure 4 The voltage and current starting curves of an X-ray source using a two-stage start-up are shown. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0038] like Figure 1 As shown, an embodiment of the present invention provides a high voltage power supply startup control method for an X-ray source, comprising:

[0039] The first voltage start-up partition, the second voltage start-up partition and the third voltage start-up partition are set according to the volt-ampere characteristic curve of the X-ray tube; wherein the maximum voltage value of the first voltage start-up partition is the minimum voltage value of the second voltage start-up partition, and the maximum voltage value of the second voltage start-up partition is the minimum voltage value of the third voltage start-up partition;

[0040] If the target starting voltage is within the first voltage partition, starting is performed at a first voltage ramp slope until the voltage reaches the maximum voltage value of the first voltage starting partition;

[0041] If the target startup voltage is within the second voltage partition, the startup is performed with the first voltage ramp slope until the voltage reaches the maximum voltage value of the first voltage partition, and then the startup is performed with the second voltage ramp slope until the voltage reaches the maximum voltage value of the second voltage partition;

[0042] If the target starting voltage is within the third voltage partition, the vehicle is first started with the first voltage climbing slope until the voltage reaches the maximum voltage value of the first voltage partition, and then started with the second voltage climbing slope until the voltage reaches the maximum voltage value of the second voltage partition; finally, the vehicle is started with the third voltage climbing slope until the voltage reaches the maximum voltage value of the third voltage partition.

[0043] Apply an initial positive DC voltage and an initial negative DC voltage of the same amplitude to the anode and cathode of the X-ray tube, respectively, and record the initial current value;

[0044] Change the positive DC voltage amplitude and negative DC voltage amplitude, and record the real-time current value;

[0045] With kV as the unit of voltage U and uA as the unit of current I, the volt-ampere characteristic curve of the X-ray tube is obtained by fitting.

[0046] The first voltage start-up partition, the second voltage start-up partition and the third voltage start-up partition are set according to the volt-ampere characteristic curve of the X-ray tube, including:

[0047] The voltage values ​​of the volt-ampere characteristic curve of the X-ray tube at the positions of curvature dI / dU=1, dI / dU=0.25 and dI / dU=0.125 are obtained as the maximum voltage value U1 of the first voltage start-up partition, the maximum voltage value U2 of the second voltage start-up partition and the maximum voltage value U3 of the third voltage start-up partition, respectively; wherein the maximum voltage value U3 is the rated voltage of the X-ray tube.

[0048] In this embodiment, if Figure 2 As shown, according to the volt-ampere electrical characteristic curve of the bulb, the first voltage, the second voltage, and the third voltage, namely the maximum voltage value U1 of the first voltage start-up partition, the maximum voltage value U2 of the second voltage start-up partition, and the maximum voltage value U3 of the third voltage start-up partition, are determined.

[0049] The full voltage startup target time (full voltage, i.e., the rated voltage of the tube) is preset, and the first voltage climbing slope from 0 voltage to the first voltage, the second voltage climbing slope from the first voltage to the second voltage, and the third voltage climbing slope from the second voltage to the third voltage are determined according to the full voltage startup target time. The numerical relationship between the three is: the first voltage climbing slope> the second voltage climbing slope> the third voltage climbing slope.

[0050] The first voltage ramp slope is:

[0051]

[0052] The second voltage ramp slope is:

[0053]

[0054] The third voltage climbing slope is:

[0055]

[0056] Wherein, T is the full voltage startup target time.

[0057] The full voltage startup target time T is greater than or equal to 250ms.

[0058] In this embodiment, the full voltage start target time has different requirements for different application scenarios. For example, in the security inspection industry, it is necessary to cooperate with the transportation speed, and the x-ray needs to be stably turned on before the inspected object reaches the detection area. If the transportation speed is fast, the full voltage start target time is required to be shortened; if the transportation speed is fast, the full voltage start target time is appropriately extended. In the medical industry, low doses are required, so the full voltage start target time is required to be as short as possible. In a specific embodiment, the full voltage start target time is set according to actual needs.

[0059] As an optional implementation, it also includes:

[0060] When the target startup voltage is within the first voltage partition, the high voltage power supply is placed in a ZCS zero current switching state, and the high voltage power supply only outputs high voltage but no current.

[0061] When the target startup voltage is within the second voltage partition or the third voltage partition, the current output of the high voltage power supply is no longer suppressed, so that the current of the high voltage power supply is output along with the voltage.

[0062] like Figure 3 As shown, the high voltage power supply startup control method for an X-ray source provided by an embodiment of the present invention is adopted, the yellow line is the voltage curve, and the overshoot of the current (green line) is 4%. Figure 4Using the existing two-stage starting method, the overshoot of the current (green line) is 10%.

[0063] The embodiment of the present invention provides a high-voltage power supply startup control method for an X-ray source, which adopts a three-stage voltage startup. By gradually reaching the working voltage, the X-ray tube can work in a stable state, which helps to improve the quality of imaging. The three-stage startup avoids thermal shock and mechanical stress caused by rapid voltage changes, thereby reducing the failure rate of the X-ray tube and other power supply components.

[0064] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A high voltage power supply startup control method for an X-ray source, characterized in that: include: A first voltage start-up partition, a second voltage start-up partition and a third voltage start-up partition are set according to the volt-ampere characteristic curve of the X-ray tube; wherein the maximum voltage value of the first voltage start-up partition is the minimum voltage value of the second voltage start-up partition, and the maximum voltage value of the second voltage start-up partition is the minimum voltage value of the third voltage start-up partition; If the target starting voltage is within the first voltage partition, starting is performed at a first voltage ramp slope until the voltage reaches a maximum voltage value of the first voltage starting partition; If the target startup voltage is within the second voltage partition, the startup is performed with the first voltage ramp slope until the voltage reaches the maximum voltage value of the first voltage partition, and then the startup is performed with the second voltage ramp slope until the voltage reaches the maximum voltage value of the second voltage partition; If the target starting voltage is within the third voltage partition, the vehicle is first started with the first voltage climbing slope until the voltage reaches the maximum voltage value of the first voltage partition, and then started with the second voltage climbing slope until the voltage reaches the maximum voltage value of the second voltage partition; finally, the vehicle is started with the third voltage climbing slope until the voltage reaches the maximum voltage value of the third voltage partition.

2. The high voltage power supply startup control method for an X-ray source according to claim 1, characterized in that: The first voltage start-up partition, the second voltage start-up partition and the third voltage start-up partition are set according to the volt-ampere characteristic curve of the X-ray tube, including: The voltage values ​​of the volt-ampere characteristic curve of the X-ray tube at the positions of curvature dI / dU=1, dI / dU=0.25 and dI / dU=0.125 are obtained as the maximum voltage value U1 of the first voltage start-up partition, the maximum voltage value U2 of the second voltage start-up partition and the maximum voltage value U3 of the third voltage start-up partition respectively; wherein the maximum voltage value U3 is the rated voltage of the X-ray tube.

3. The high voltage power supply startup control method for an X-ray source according to claim 2, characterized in that: The first voltage climbing slope is: The second voltage climbing slope is: The third voltage climbing slope is: Wherein, T is the full voltage startup target time.

4. The high voltage power supply startup control method for an X-ray source according to claim 3, characterized in that: The full voltage startup target time T is greater than or equal to 250 ms.

5. The high voltage power supply startup control method for an X-ray source according to claim 1, characterized in that: Also includes: When the target startup voltage is within the first voltage partition, placing the high voltage power supply in a zero current switching state; When the target startup voltage is within the second voltage partition or the third voltage partition, the current of the high voltage power supply is output along with the voltage.

6. The high voltage power supply startup control method for an X-ray source according to claim 1, characterized in that: The minimum voltage of the first voltage partition is 0.

7. The high voltage power supply startup control method for an X-ray source according to claim 1, characterized in that: Also includes: Applying an initial positive DC voltage and an initial negative DC voltage of the same amplitude to the anode and cathode of the X-ray tube, respectively, and recording the initial current value; Change the positive DC voltage amplitude and negative DC voltage amplitude, and record the real-time current value; The volt-ampere characteristic curve of the X-ray tube is obtained by fitting, with kV as the unit of voltage U and uA as the unit of current I.

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